CN202405740U - Current-limiting protection circuit of alternating current power supply loop - Google Patents
Current-limiting protection circuit of alternating current power supply loop Download PDFInfo
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- CN202405740U CN202405740U CN201120548189XU CN201120548189U CN202405740U CN 202405740 U CN202405740 U CN 202405740U CN 201120548189X U CN201120548189X U CN 201120548189XU CN 201120548189 U CN201120548189 U CN 201120548189U CN 202405740 U CN202405740 U CN 202405740U
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- 230000002441 reversible effect Effects 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model provides a current-limiting protection circuit of an alternating current power supply loop. The current-limiting protection circuit is connected in series with the alternating current power supply loop which is required to be protected through an entry A and an exit B and comprises a current signal circuit, a comparative control circuit and a driving circuit, wherein the current signal circuit, the comparative control circuit and the driving circuit are connected with one another and connected with a switch topology circuit. According to the current-limiting protective circuit, real-time sampling is performed by means of conducting voltage drop lines at two ends of an insulated gate bipolar translator (IGBT), line monitoring of current passing through a main circuit is performed indirectly, excess current in the circuit is detected directly and is compared in real time, the circuit is disconnected to achieve protection, the opening and closing operation is rapid, contact electric arcs are avoided, the current-limiting protective protection circuit can be restored and controlled automatically, and the working efficiency is high.
Description
Technical field
The utility model relates to the current-limiting protection circuit of electrical field, particularly relates to a kind of current-limiting protection circuit of ac power supply circuit.
Background technology
Generally, the overcurrent protection method of civilian electricity is embodied on the circuit breaker (sky is opened), and its protection form has pair distribution inlet that lightning protection, insurance are set, or adjusts after to current measurement based on the undesirable mutual electromagnetic inductance device, and then the step switch device is realized protection.
Lightning protection is the effectively overcurrent mode that system is provided with, and only also protects through passive device (material) to the lightning surge electric current, and protective capability is limited; Fuse adopts overcurrent to fuse automatically, thereby plays the purpose of open circuit, and means are passive, and wanting to recover need be manual again; A lot of switches also have through the coil-induced current value and the protection of adjusting through overcurrent excitation unit action breaker, open such as earth leakage protective device, surge current protection device, electromagnetic type sky etc.All need when recovering manually, control device falls behind, and has limited the scope of application again.
Following demand to the circuit overcurrent protection, the current-limiting protection technology that especially need be provided with under the situation of automatic protection at device interior is demanded exploitation urgently.
Summary of the invention
To the deficiency of structure in the overcurrent protection in the prior art, the purpose of this invention is to provide a kind of current-limiting protection circuit of ac power supply circuit, can realize that cut-off current is adjustable continuously, be beneficial to the shutoff of accurate, safe control circuit.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts provides a kind of current-limiting protection circuit of ac power supply circuit; This current-limiting protection circuit is connected in the ac power supply circuit that needs protection, wherein through inlet A and outlet B: said current-limiting protection circuit includes interconnective current signal circuit, comparison control circuit and the drive circuit that links to each other with switch topology circuit.
Said switch topology circuit includes two reversible insulated gate gate pole transistor IGBTs of leading; Two reversible anodes of leading insulated gate gate pole transistor IGBT link to each other with outlet B with the inlet A of said circuit respectively; Two reversible negative electrodes of leading insulated gate gate pole transistor IGBT link to each other jointly; Form intermediate point RGND, intermediate point RGND links to each other with power supply ground GND simultaneously; Two reversible gate poles of leading insulated gate gate pole transistor IGBT link to each other with intermediate point RGND through a resistance respectively, also link to each other with drive circuit through a resistance respectively simultaneously.
Said current signal circuit includes two voltage stabilizing didoes; The anode of two voltage stabilizing didoes is connected to the intermediate point RGND of switching circuit respectively; The negative electrode of two voltage stabilizing didoes is connected to the inlet A and outlet B of said circuit respectively through a resistance, also be connected with comparison control circuit through a resistance respectively simultaneously.
Said comparison control circuit includes two operational amplifiers; The in-phase input end of operational amplifier A 1, operational amplifier A 2 is connected in external reference reference voltage terminal Vref through a substitutional resistance respectively; Simultaneously the in-phase input end of operational amplifier A 1, operational amplifier A 2 output of also distinguishing same RC parallel circuit and operational amplifier A 1, operational amplifier A 2 links to each other, and forms the positive feedback comparator; The inverting input of operational amplifier A 1, operational amplifier A 2 is accepted the signal input of current signal circuit respectively through resistance; The output of operational amplifier A 1, operational amplifier A 2 links to each other with power supply VCC through a resistance respectively.
Said drive circuit is the complementary symmetrical power amplification circuit of Class B.
The utility model through to IGBT two ends conduction voltage drop through the row real-time sampling, indirectly main circuit is flow through electric current and carries out comparing sampled signal with reference voltage through row monitoring, when overcurrent, drive IGBT and turn-off, thereby play the purpose of current-limiting protection.Controlled, the static contactless no electric arc of power electronic device action, control is reliable, recovers convenient.
Description of drawings
Fig. 1 is the current-limiting protection circuit structural representation of the ac power supply circuit of the utility model.
Embodiment
In conjunction with accompanying drawing the current-limiting protection circuit structure of the ac power supply circuit of the utility model is explained.
As shown in Figure 1; The current-limiting protection circuit of the ac power supply circuit of the utility model; This current-limiting protection circuit is connected in the ac power supply circuit that needs protection through inlet A and outlet B, and said current-limiting protection circuit includes interconnective current signal circuit, comparison control circuit and the drive circuit that links to each other with switch topology circuit.Said drive circuit is the complementary symmetrical power amplification circuit of Class B.
Said switch topology circuit includes two reversible insulated gate gate pole transistor IGBTs of leading; Two reversible anodes of leading insulated gate gate pole transistor IGBT link to each other with outlet B with the inlet A of said circuit respectively; Two reversible negative electrodes of leading insulated gate gate pole transistor IGBT link to each other jointly; Form intermediate point RGND, intermediate point RGND links to each other with power supply ground GND simultaneously; Two reversible gate poles of leading insulated gate gate pole transistor IGBT link to each other with intermediate point RGND through a resistance respectively, also link to each other with drive circuit through a resistance respectively simultaneously.
Said current signal circuit includes two voltage stabilizing didoes; The anode of two voltage stabilizing didoes is connected to the intermediate point RGND of switching circuit respectively; The negative electrode of two voltage stabilizing didoes is connected to the inlet A and outlet B of said circuit respectively through a resistance, also be connected with comparison control circuit through a resistance respectively simultaneously.
Said comparison control circuit includes two operational amplifiers; The in-phase input end of operational amplifier A 1, operational amplifier A 2 is connected in external reference reference voltage terminal Vref through a substitutional resistance respectively; Simultaneously the in-phase input end of operational amplifier A 1, operational amplifier A 2 output of also distinguishing same RC parallel circuit and operational amplifier A 1, operational amplifier A 2 links to each other, and forms the positive feedback comparator; The inverting input of operational amplifier A 1, operational amplifier A 2 is accepted the signal input of current signal circuit respectively through resistance; The output of operational amplifier A 1, operational amplifier A 2 links to each other with power supply VCC through a resistance respectively.
The overcurrent protection function implementation procedure of the current-limiting protection circuit of the ac power supply circuit of the utility model is following:
Two reversible anodes of leading insulated gate gate pole transistor IGBT in the said switch topology circuit link to each other with outlet B with the inlet A of circuit respectively, and its negative electrode links to each other jointly, forms intermediate point RGND, and intermediate point RGND power supply ground GND simultaneously links to each other; Two reversible gate poles of leading insulated gate gate pole transistor IGBT link to each other with intermediate point RGND through a resistance respectively, also link to each other with drive circuit through resistance R 5, resistance R 6 respectively simultaneously.
Voltage stabilizing didoe DZ1 in the said current signal circuit, the anode of voltage stabilizing didoe DZ2 are connected to the intermediate point RGND of switching circuit respectively; The negative electrode of voltage stabilizing didoe DZ1, voltage stabilizing didoe DZ2 is connected to the inlet A and the outlet B of circuit respectively through a resistance R 1, resistance R 2, also be connected to comparison control circuit through a resistance R 13, resistance R 14 respectively simultaneously.
Two operational amplifier A 1, operational amplifier A 2 in-phase input ends in the said comparison control circuit are connected in external reference reference voltage V ref through a substitutional resistance R15, resistance R 16 respectively; Its in-phase input end of while is also distinguished same RC parallel circuit R11//C1, RC parallel circuit R12//C2 and its output and is linked to each other, and forms the positive feedback comparator; The inverting input of these two operational amplifier A 1, operational amplifier A 2 is accepted the signal input of current signal circuit respectively through a resistance R 13, resistance R 14; The output of these two operational amplifier A 1, operational amplifier A 2 links to each other with power supply VCC through a resistance R 9, resistance R 10 respectively.
Said drive circuit is the complementary symmetrical power amplification circuit of Class B, comprises the simple power amplification drive circuit that a pair of NPN type and positive-negative-positive triode are formed; The collector electrode that is NPN type triode T1 or triode T2 links to each other with power supply VCC; Emitter links to each other with two reversible gate poles of leading insulated gate gate pole transistor IGBT through resistance R 7, resistance R 8 respectively with the generating utmost point of positive-negative-positive triode T3 or triode T4 simultaneously; The collector electrode of positive-negative-positive triode T3 or triode T4 links to each other with public ground of power supply GND; After the base stage of triode T1 and triode T3, triode T2 and triode T4 jointly linked to each other, the output through resistance R 5, resistance R 6 and comparison control circuit operational amplifier A 1, operational amplifier A 2 linked to each other.
After control power supply VCC powers on; Operational amplifier A 1, operational amplifier A 2 outputs are through drawing effect output high level on the resistance R 9; Make the triode T1, triode T3 of drive circuit get into the saturation conduction state, and then drive two and reversiblely lead the conducting of insulated gate gate pole transistor IGBT; Simple sinusoidal alternating current flows into from the A mouth; Last half-wave is led diode VD2 and is flowed out from the B mouth with another reversible lead insulated gate gate pole transistor IGBT contrary through a reversible insulated gate gate pole transistor IGBT conductive channel of leading; Following half-wave reversible is led flowing out from the B mouth of insulated gate gate pole transistor IGBT conductive channel through a reversible contrary diode VD1 that leads that leads insulated gate gate pole transistor IGBT with another, thereby following two the reversible insulated gate gate pole transistor IGBTs of leading of normal condition are in the simple sinusoidal alternating current all-wave passage of often opening.No matter reversiblely lead the transistor IGBT conducting of insulated gate gate pole or when turn-offing at two, two contrary leads diode and all can not form conductive channel separately.
When the electric current that flows through in the circuit changed, the relative voltage that electric current inlet A is ordered changed, when peak value reaches certain value; Signal voltage makes comparator output signal voltage near with 0 when surpassing reference voltage value, drive two reversible insulated gate gate pole transistor IGBTs of leading simultaneously and turn-off, thereby realize overcurrent protection function.Because two bands are contrary leads diode and is connected back-to-back with two reversible insulated gate gate pole transistor IGBTs of leading, in like manner, when electric current when the B mouth flows into, also can realize overcurrent protection function, this has just realized the overcurrent protection at ac circuit.
Claims (5)
1. the current-limiting protection circuit of an ac power supply circuit; This current-limiting protection circuit is connected in the ac power supply circuit that needs protection through inlet A and outlet B, and it is characterized in that: said current-limiting protection circuit includes interconnective current signal circuit, comparison control circuit and the drive circuit that links to each other with switch topology circuit.
2. according to the current-limiting protection circuit of the said ac power supply circuit of claim 1; It is characterized in that: said switch topology circuit includes two reversible insulated gate gate pole transistor IGBTs of leading; Two reversible anodes of leading insulated gate gate pole transistor IGBT link to each other with outlet B with the inlet A of said circuit respectively; Two reversible negative electrodes of leading insulated gate gate pole transistor IGBT link to each other jointly, form intermediate point RGND, and intermediate point RGND links to each other with power supply ground GND simultaneously; Two reversible gate poles of leading insulated gate gate pole transistor IGBT link to each other with intermediate point RGND through a resistance respectively, also link to each other with drive circuit through a resistance respectively simultaneously.
3. according to the current-limiting protection circuit of the said ac power supply circuit of claim 1; It is characterized in that: said current signal circuit includes two voltage stabilizing didoes; The anode of two voltage stabilizing didoes is connected to the intermediate point RGND of switching circuit respectively; The negative electrode of two voltage stabilizing didoes is connected to the inlet A and outlet B of said circuit respectively through a resistance, also be connected with comparison control circuit through a resistance respectively simultaneously.
4. according to the current-limiting protection circuit of the said ac power supply circuit of claim 1; It is characterized in that: said comparison control circuit includes two operational amplifiers; The in-phase input end of operational amplifier A 1, operational amplifier A 2 is connected in external reference reference voltage terminal Vref through a substitutional resistance respectively; Simultaneously the in-phase input end of operational amplifier A 1, operational amplifier A 2 output of also distinguishing same RC parallel circuit and operational amplifier A 1, operational amplifier A 2 links to each other, and forms the positive feedback comparator; The inverting input of operational amplifier A 1, operational amplifier A 2 is accepted the signal input of current signal circuit respectively through resistance; The output of operational amplifier A 1, operational amplifier A 2 links to each other with power supply VCC through a resistance respectively.
5. according to the current-limiting protection circuit of the said ac power supply circuit of claim 1, it is characterized in that: said drive circuit is the complementary symmetrical power amplification circuit of Class B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120548189XU CN202405740U (en) | 2011-12-23 | 2011-12-23 | Current-limiting protection circuit of alternating current power supply loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120548189XU CN202405740U (en) | 2011-12-23 | 2011-12-23 | Current-limiting protection circuit of alternating current power supply loop |
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| Publication Number | Publication Date |
|---|---|
| CN202405740U true CN202405740U (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120548189XU Expired - Fee Related CN202405740U (en) | 2011-12-23 | 2011-12-23 | Current-limiting protection circuit of alternating current power supply loop |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109960302A (en) * | 2017-12-22 | 2019-07-02 | 和硕联合科技股份有限公司 | Current-limiting circuit structure and its control method |
| WO2023207111A1 (en) * | 2022-04-29 | 2023-11-02 | 惠科股份有限公司 | Pixel driver circuit and display panel |
-
2011
- 2011-12-23 CN CN201120548189XU patent/CN202405740U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109960302A (en) * | 2017-12-22 | 2019-07-02 | 和硕联合科技股份有限公司 | Current-limiting circuit structure and its control method |
| WO2023207111A1 (en) * | 2022-04-29 | 2023-11-02 | 惠科股份有限公司 | Pixel driver circuit and display panel |
| US11948511B2 (en) | 2022-04-29 | 2024-04-02 | HKC Corporation Limited | Pixel driving circuit and display panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Current-limiting protection circuit of alternating current power supply loop Effective date of registration: 20140324 Granted publication date: 20120829 Pledgee: Tianjin Dongfang Haixin SME Company limited by guarantee Pledgor: Chuantie Electric (Tianjin) Group Co., Ltd. Registration number: 2014120000017 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20150327 Granted publication date: 20120829 Pledgee: Tianjin Dongfang Haixin SME Company limited by guarantee Pledgor: Chuantie Electric (Tianjin) Group Co., Ltd. Registration number: 2014120000017 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Current-limiting protection circuit of alternating current power supply loop Effective date of registration: 20150608 Granted publication date: 20120829 Pledgee: Tianjin Dongfang Haixin SME Company limited by guarantee Pledgor: Chuantie Electric (Tianjin) Group Co., Ltd. Registration number: 2015120000040 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 300300 Tianjin Jinqiao Industrial Park, Dongli, Sichuan railway No. 3 Patentee after: Kawatetsu electrical (Tianjin) Limited by Share Ltd Address before: 300300 Tianjin Jinqiao Industrial Park, Dongli, Sichuan railway No. 3 Patentee before: Chuantie Electric (Tianjin) Group Co., Ltd. |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PM01 | Change of the registration of the contract for pledge of patent right |
Change date: 20160612 Registration number: 2015120000040 Pledgor after: Kawatetsu electrical (Tianjin) Limited by Share Ltd Pledgor before: Chuantie Electric (Tianjin) Group Co., Ltd. |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20160617 Granted publication date: 20120829 Pledgee: Tianjin Dongfang Haixin SME Company limited by guarantee Pledgor: Kawatetsu electrical (Tianjin) Limited by Share Ltd Registration number: 2015120000040 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20171223 |
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| CF01 | Termination of patent right due to non-payment of annual fee |